feat: add option to override destination of access log

When SystemPolicy.OverrideAccessLogDest is enabled, destination host
in access log will be replaced with sniffed host. (#866)

app/dispatcher/default.go

@@ -326,6 +326,9 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 	if accessMessage := log.AccessMessageFromContext(ctx); accessMessage != nil {
 		if tag := handler.Tag(); tag != "" {
 			accessMessage.Detour = tag
+			if d.policy.ForSystem().OverrideAccessLogDest {
+				accessMessage.To = destination
+			}
 		}
 		log.Record(accessMessage)
 	}

app/policy/config.go

@@ -89,5 +89,6 @@ func (p *SystemPolicy) ToCorePolicy() policy.System {
 			OutboundUplink:   p.Stats.OutboundUplink,
 			OutboundDownlink: p.Stats.OutboundDownlink,
 		},
+		OverrideAccessLogDest: p.OverrideAccessLogDest,
 	}
 }

app/policy/config.pb.go

@@ -130,7 +130,8 @@ type SystemPolicy struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Stats *SystemPolicy_Stats `protobuf:"bytes,1,opt,name=stats,proto3" json:"stats,omitempty"`
+	Stats                 *SystemPolicy_Stats `protobuf:"bytes,1,opt,name=stats,proto3" json:"stats,omitempty"`
+	OverrideAccessLogDest bool                `protobuf:"varint,2,opt,name=override_access_log_dest,json=overrideAccessLogDest,proto3" json:"override_access_log_dest,omitempty"`
 }
 
 func (x *SystemPolicy) Reset() {
@@ -172,6 +173,13 @@ func (x *SystemPolicy) GetStats() *SystemPolicy_Stats {
 	return nil
 }
 
+func (x *SystemPolicy) GetOverrideAccessLogDest() bool {
+	if x != nil {
+		return x.OverrideAccessLogDest
+	}
+	return false
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -520,45 +528,49 @@ var file_app_policy_config_proto_rawDesc = []byte{
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 }
 
 var (

app/policy/config.proto

@@ -45,6 +45,7 @@ message SystemPolicy {
   }
 
   Stats stats = 1;
+  bool override_access_log_dest = 2;
 }
 
 message Config {

features/policy/policy.go

@@ -49,8 +49,9 @@ type SystemStats struct {
 
 // System contains policy settings at system level.
 type System struct {
-	Stats  SystemStats
-	Buffer Buffer
+	Stats                 SystemStats
+	OverrideAccessLogDest bool
+	Buffer                Buffer
 }
 
 // Session is session based settings for controlling V2Ray requests. It contains various settings (or limits) that may differ for different users in the context.

infra/conf/v4/policy.go

@@ -55,6 +55,7 @@ type SystemPolicy struct {
 	StatsInboundDownlink  bool `json:"statsInboundDownlink"`
 	StatsOutboundUplink   bool `json:"statsOutboundUplink"`
 	StatsOutboundDownlink bool `json:"statsOutboundDownlink"`
+	OverrideAccessLogDest bool `json:"overrideAccessLogDest"`
 }
 
 func (p *SystemPolicy) Build() (*policy.SystemPolicy, error) {
@@ -65,6 +66,7 @@ func (p *SystemPolicy) Build() (*policy.SystemPolicy, error) {
 			OutboundUplink:   p.StatsOutboundUplink,
 			OutboundDownlink: p.StatsOutboundDownlink,
 		},
+		OverrideAccessLogDest: p.OverrideAccessLogDest,
 	}, nil
 }